Is the original kdbx file used on windows or another operating system? If you use windows, simply do what @JChristian answered, otherwise edit your question to include the OS you have access to
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tutuDajujuFeb 24 '14 at 8:31

4 Answers
4

Try KeePassX 2 (Alpha) as suggested by Daniel B,

www.keepassx.org/news/2013/03/393 worked for me.

(If someone with the reputation wants to make this a link, please do.)

run it in a Windows VM, or

Download the "Professional" (2.n) Windows version of KeePass, and run it in a Windows VM. You can shared the file either through a VM-runner-host shared folder (let VirtualBox or VMWare do the magic for you), or you can share the file through a networked drive.

Once you have the file in windows you can either export the v2 file to a v1 type, or make a habit of starting the VM to modify KeePass (in which case I would recommend suspending/pausing the VM rather than shutting it down).

attempt to run it using Mono.

There is a recommendation buried in the KeePass.info site to use Mono and XQuartz, to support the .NET dependencies with free and many-system-compatible libraries. I had less than complete success with this method, possibly due to the version of OSX I'm running, 10.7.5. The application would open, but before it offered a database selection and password window, would suddenly close and generate an Apple error report.